use vectors for symbol slots

* src/alloc.c (initialize_symbol): Use Guile vectors to store symbol
  slots.

* src/lisp.h (lisp_h_SET_SYMBOL_VAL, lisp_h_SYMBOL_CONSTANT_P)
  (lisp_h_SYMBOL_VAL): Use Guile vectors to store symbol slots.
  (sym_t): New typedef.
  (SYMBOL_SELF, SET_SYMBOL_SELF, SYMBOL_REDIRECT, SET_SYMBOL_REDIRECT)
  (SYMBOL_CONSTANT, SET_SYMBOL_CONSTANT, SYMBOL_DECLARED_SPECIAL)
  (SET_SYMBOL_DECLARED_SPECIAL): New macros.
  (struct Lisp_Symbol): Change all field names. All references changed
  to use `sym_t' and the above macros instead.

9 files changed, 161 insertions, 151 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 3fe4601010..a300396514 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -1168,17 +1168,17 @@ usage: (make-byte-code ARGLIST BYTE-CODE CONSTANTS DEPTH &optional DOCSTRING INT
 void
 initialize_symbol (Lisp_Object val, Lisp_Object name)
 {
-  struct Lisp_Symbol *p = xmalloc (sizeof *p);
+  sym_t p;
 
-  scm_module_define (symbol_module, val, scm_from_pointer (p, NULL));
+  scm_module_define (symbol_module, val, scm_c_make_vector (5, SCM_BOOL_F));
   p = XSYMBOL (val);
-  p->self = val;
+  SET_SYMBOL_SELF (p, val);
   scm_module_define (plist_module, val, Qnil);
-  p->redirect = SYMBOL_PLAINVAL;
+  SET_SYMBOL_REDIRECT (p, SYMBOL_PLAINVAL);
   SET_SYMBOL_VAL (p, Qunbound);
   scm_module_define (function_module, val, Qnil);
-  p->constant = 0;
-  p->declared_special = false;
+  SET_SYMBOL_CONSTANT (p, 0);
+  SET_SYMBOL_DECLARED_SPECIAL (p, false);
 }
 
 DEFUN ("make-symbol", Fmake_symbol, Smake_symbol, 1, 1, 0,
diff --git a/src/buffer.c b/src/buffer.c
index 7f0f2cc7d0..f310a2c9d8 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1182,7 +1182,7 @@ buffer_local_value (Lisp_Object variable, Lisp_Object buffer)
 {
   register struct buffer *buf;
   register Lisp_Object result;
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (variable);
   CHECK_BUFFER (buffer);
@@ -1190,7 +1190,7 @@ buffer_local_value (Lisp_Object variable, Lisp_Object buffer)
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: result = SYMBOL_VAL (sym); break;
@@ -2159,8 +2159,8 @@ set_buffer_internal_1 (register struct buffer *b)
       for (tail = BVAR (b, local_var_alist); CONSP (tail); tail = XCDR (tail))
 	{
 	  Lisp_Object var = XCAR (XCAR (tail));
-	  struct Lisp_Symbol *sym = XSYMBOL (var);
-	  if (sym->redirect == SYMBOL_LOCALIZED /* Just to be sure.  */
+	  sym_t sym = XSYMBOL (var);
+	  if (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED /* Just to be sure.  */
 	      && SYMBOL_BLV (sym)->fwd)
 	    /* Just reference the variable
 	       to cause it to become set for this buffer.  */
@@ -2801,7 +2801,7 @@ swap_out_buffer_local_variables (struct buffer *b)
   for (alist = oalist; CONSP (alist); alist = XCDR (alist))
     {
       Lisp_Object sym = XCAR (XCAR (alist));
-      eassert (XSYMBOL (sym)->redirect == SYMBOL_LOCALIZED);
+      eassert (SYMBOL_REDIRECT (XSYMBOL (sym)) == SYMBOL_LOCALIZED);
       /* Need not do anything if some other buffer's binding is
 	 now cached.  */
       if (EQ (SYMBOL_BLV (XSYMBOL (sym))->where, buffer))
@@ -5403,7 +5403,7 @@ static void
 defvar_per_buffer (struct Lisp_Buffer_Objfwd *bo_fwd, const char *namestring,
 		   Lisp_Object *address, Lisp_Object predicate)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   int offset;
 
   sym = XSYMBOL (intern (namestring));
@@ -5412,8 +5412,8 @@ defvar_per_buffer (struct Lisp_Buffer_Objfwd *bo_fwd, const char *namestring,
   bo_fwd->type = Lisp_Fwd_Buffer_Obj;
   bo_fwd->offset = offset;
   bo_fwd->predicate = predicate;
-  sym->declared_special = 1;
-  sym->redirect = SYMBOL_FORWARDED;
+  SET_SYMBOL_DECLARED_SPECIAL (sym, 1);
+  SET_SYMBOL_REDIRECT (sym, SYMBOL_FORWARDED);
   SET_SYMBOL_FWD (sym, (union Lisp_Fwd *) bo_fwd);
   XSETSYMBOL (PER_BUFFER_SYMBOL (offset), sym);
 
@@ -5737,7 +5737,7 @@ file I/O and the behavior of various editing commands.
 This variable is buffer-local but you cannot set it directly;
 use the function `set-buffer-multibyte' to change a buffer's representation.
 See also Info node `(elisp)Text Representations'.  */);
-  XSYMBOL (intern_c_string ("enable-multibyte-characters"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("enable-multibyte-characters")), 1);
 
   DEFVAR_PER_BUFFER ("buffer-file-coding-system",
 		     &BVAR (current_buffer, buffer_file_coding_system), Qnil,
diff --git a/src/bytecode.c b/src/bytecode.c
index 6e91da11a1..7e7063e131 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -647,7 +647,7 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
 	    v1 = vectorp[op];
 	    if (SYMBOLP (v1))
 	      {
-		if (XSYMBOL (v1)->redirect != SYMBOL_PLAINVAL
+		if (SYMBOL_REDIRECT (XSYMBOL (v1)) != SYMBOL_PLAINVAL
 		    || (v2 = SYMBOL_VAL (XSYMBOL (v1)),
 			EQ (v2, Qunbound)))
 		  {
@@ -756,7 +756,7 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
 	    /* Inline the most common case.  */
 	    if (SYMBOLP (sym)
 		&& !EQ (val, Qunbound)
-		&& !XSYMBOL (sym)->redirect
+		&& !SYMBOL_REDIRECT (XSYMBOL (sym))
 		&& !SYMBOL_CONSTANT_P (sym))
 	      SET_SYMBOL_VAL (XSYMBOL (sym), val);
 	    else
diff --git a/src/data.c b/src/data.c
index 7422f4e8b8..79e605b731 100644
--- a/src/data.c
+++ b/src/data.c
@@ -91,7 +91,7 @@ Lisp_Object Qspecial_operator;
 Lisp_Object Qinteractive_form;
 static Lisp_Object Qdefalias_fset_function;
 
-static void swap_in_symval_forwarding (struct Lisp_Symbol *, struct Lisp_Buffer_Local_Value *);
+static void swap_in_symval_forwarding (sym_t, struct Lisp_Buffer_Local_Value *);
 
 static bool
 BOOLFWDP (union Lisp_Fwd *a)
@@ -620,12 +620,12 @@ global value outside of any lexical scope.  */)
   (register Lisp_Object symbol)
 {
   Lisp_Object valcontents;
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   CHECK_SYMBOL (symbol);
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_PLAINVAL: valcontents = SYMBOL_VAL (sym); break;
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
@@ -893,17 +893,17 @@ Value, if non-nil, is a list \(interactive SPEC).  */)
    `cyclic-variable-indirection' if SYMBOL's chain of variable
    indirections contains a loop.  */
 
-struct Lisp_Symbol *
-indirect_variable (struct Lisp_Symbol *symbol)
+sym_t
+indirect_variable (sym_t symbol)
 {
-  struct Lisp_Symbol *tortoise, *hare;
+  sym_t tortoise, hare;
 
   hare = tortoise = symbol;
 
-  while (hare->redirect == SYMBOL_VARALIAS)
+  while (SYMBOL_REDIRECT (hare) == SYMBOL_VARALIAS)
     {
       hare = SYMBOL_ALIAS (hare);
-      if (hare->redirect != SYMBOL_VARALIAS)
+      if (SYMBOL_REDIRECT (hare) != SYMBOL_VARALIAS)
 	break;
 
       hare = SYMBOL_ALIAS (hare);
@@ -933,7 +933,7 @@ chain of aliases, signal a `cyclic-variable-indirection' error.  */)
 {
   if (SYMBOLP (object))
     {
-      struct Lisp_Symbol *sym = indirect_variable (XSYMBOL (object));
+      sym_t sym = indirect_variable (XSYMBOL (object));
       XSETSYMBOL (object, sym);
     }
   return object;
@@ -1068,7 +1068,7 @@ store_symval_forwarding (union Lisp_Fwd *valcontents, register Lisp_Object newva
    of BLV are marked after this function has changed them.  */
 
 void
-swap_in_global_binding (struct Lisp_Symbol *symbol)
+swap_in_global_binding (sym_t symbol)
 {
   struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (symbol);
 
@@ -1094,7 +1094,7 @@ swap_in_global_binding (struct Lisp_Symbol *symbol)
    This could be another forwarding pointer.  */
 
 static void
-swap_in_symval_forwarding (struct Lisp_Symbol *symbol, struct Lisp_Buffer_Local_Value *blv)
+swap_in_symval_forwarding (sym_t symbol, struct Lisp_Buffer_Local_Value *blv)
 {
   register Lisp_Object tem1;
 
@@ -1146,13 +1146,13 @@ swap_in_symval_forwarding (struct Lisp_Symbol *symbol, struct Lisp_Buffer_Local_
 Lisp_Object
 find_symbol_value (Lisp_Object symbol)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (symbol);
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return SYMBOL_VAL (sym);
@@ -1205,7 +1205,7 @@ set_internal (Lisp_Object symbol, Lisp_Object newval, Lisp_Object where,
 	      bool bindflag)
 {
   bool voide = EQ (newval, Qunbound);
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   Lisp_Object tem1;
 
   /* If restoring in a dead buffer, do nothing.  */
@@ -1226,7 +1226,7 @@ set_internal (Lisp_Object symbol, Lisp_Object newval, Lisp_Object where,
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: SET_SYMBOL_VAL (sym , newval); return;
@@ -1336,7 +1336,7 @@ set_internal (Lisp_Object symbol, Lisp_Object newval, Lisp_Object where,
 	if (voide)
 	  { /* If storing void (making the symbol void), forward only through
 	       buffer-local indicator, not through Lisp_Objfwd, etc.  */
-	    sym->redirect = SYMBOL_PLAINVAL;
+	    SET_SYMBOL_REDIRECT (sym, SYMBOL_PLAINVAL);
 	    SET_SYMBOL_VAL (sym, newval);
 	  }
 	else
@@ -1356,13 +1356,13 @@ set_internal (Lisp_Object symbol, Lisp_Object newval, Lisp_Object where,
 static Lisp_Object
 default_value (Lisp_Object symbol)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (symbol);
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return SYMBOL_VAL (sym);
@@ -1430,7 +1430,7 @@ The default value is seen in buffers that do not have their own values
 for this variable.  */)
   (Lisp_Object symbol, Lisp_Object value)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (symbol);
   if (SYMBOL_CONSTANT_P (symbol))
@@ -1445,7 +1445,7 @@ for this variable.  */)
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return Fset (symbol, value);
@@ -1536,7 +1536,7 @@ union Lisp_Val_Fwd
   };
 
 static struct Lisp_Buffer_Local_Value *
-make_blv (struct Lisp_Symbol *sym, bool forwarded,
+make_blv (sym_t sym, bool forwarded,
 	  union Lisp_Val_Fwd valcontents)
 {
   struct Lisp_Buffer_Local_Value *blv = xmalloc (sizeof *blv);
@@ -1582,7 +1582,7 @@ property.
 The function `default-value' gets the default value and `set-default' sets it.  */)
   (register Lisp_Object variable)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   struct Lisp_Buffer_Local_Value *blv = NULL;
   union Lisp_Val_Fwd valcontents IF_LINT (= {LISP_INITIALLY_ZERO});
   bool forwarded IF_LINT (= 0);
@@ -1591,7 +1591,7 @@ The function `default-value' gets the default value and `set-default' sets it.
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL:
@@ -1616,13 +1616,13 @@ The function `default-value' gets the default value and `set-default' sets it.
     default: emacs_abort ();
     }
 
-  if (sym->constant)
+  if (SYMBOL_CONSTANT (sym))
     error ("Symbol %s may not be buffer-local", SDATA (SYMBOL_NAME (variable)));
 
   if (!blv)
     {
       blv = make_blv (sym, forwarded, valcontents);
-      sym->redirect = SYMBOL_LOCALIZED;
+      SET_SYMBOL_REDIRECT (sym, SYMBOL_LOCALIZED);
       SET_SYMBOL_BLV (sym, blv);
       {
 	Lisp_Object symbol;
@@ -1662,14 +1662,14 @@ Instead, use `add-hook' and specify t for the LOCAL argument.  */)
   Lisp_Object tem;
   bool forwarded IF_LINT (= 0);
   union Lisp_Val_Fwd valcontents IF_LINT (= {LISP_INITIALLY_ZERO});
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   struct Lisp_Buffer_Local_Value *blv = NULL;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL:
@@ -1689,7 +1689,7 @@ Instead, use `add-hook' and specify t for the LOCAL argument.  */)
     default: emacs_abort ();
     }
 
-  if (sym->constant)
+  if (SYMBOL_CONSTANT (sym))
     error ("Symbol %s may not be buffer-local",
 	   SDATA (SYMBOL_NAME (variable)));
 
@@ -1705,7 +1705,7 @@ Instead, use `add-hook' and specify t for the LOCAL argument.  */)
   if (!blv)
     {
       blv = make_blv (sym, forwarded, valcontents);
-      sym->redirect = SYMBOL_LOCALIZED;
+      SET_SYMBOL_REDIRECT (sym, SYMBOL_LOCALIZED);
       SET_SYMBOL_BLV (sym, blv);
       {
 	Lisp_Object symbol;
@@ -1761,13 +1761,13 @@ From now on the default value will apply in this buffer.  Return VARIABLE.  */)
 {
   register Lisp_Object tem;
   struct Lisp_Buffer_Local_Value *blv;
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return variable;
@@ -1848,14 +1848,14 @@ frame-local bindings).  */)
 {
   bool forwarded;
   union Lisp_Val_Fwd valcontents;
-  struct Lisp_Symbol *sym;
+  sym_t sym;
   struct Lisp_Buffer_Local_Value *blv = NULL;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL:
@@ -1878,12 +1878,12 @@ frame-local bindings).  */)
     default: emacs_abort ();
     }
 
-  if (sym->constant)
+  if (SYMBOL_CONSTANT (sym))
     error ("Symbol %s may not be frame-local", SDATA (SYMBOL_NAME (variable)));
 
   blv = make_blv (sym, forwarded, valcontents);
   blv->frame_local = 1;
-  sym->redirect = SYMBOL_LOCALIZED;
+  SET_SYMBOL_REDIRECT (sym, SYMBOL_LOCALIZED);
   SET_SYMBOL_BLV (sym, blv);
   {
     Lisp_Object symbol;
@@ -1902,7 +1902,7 @@ BUFFER defaults to the current buffer.  */)
   (register Lisp_Object variable, Lisp_Object buffer)
 {
   register struct buffer *buf;
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   if (NILP (buffer))
     buf = current_buffer;
@@ -1916,7 +1916,7 @@ BUFFER defaults to the current buffer.  */)
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return Qnil;
@@ -1967,13 +1967,13 @@ value in BUFFER, or if VARIABLE is automatically buffer-local (see
 `make-variable-buffer-local').  */)
   (register Lisp_Object variable, Lisp_Object buffer)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return Qnil;
@@ -2000,7 +2000,7 @@ If the current binding is frame-local, the value is the selected frame.
 If the current binding is global (the default), the value is nil.  */)
   (register Lisp_Object variable)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (variable);
   sym = XSYMBOL (variable);
@@ -2009,7 +2009,7 @@ If the current binding is global (the default), the value is nil.  */)
   find_symbol_value (variable);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
     case SYMBOL_PLAINVAL: return Qnil;
@@ -2027,7 +2027,7 @@ If the current binding is global (the default), the value is nil.  */)
 	 buffer's or frame's value we are saving.  */
       if (!NILP (Flocal_variable_p (variable, Qnil)))
 	return Fcurrent_buffer ();
-      else if (sym->redirect == SYMBOL_LOCALIZED
+      else if (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED
 	       && blv_found (SYMBOL_BLV (sym)))
 	return SYMBOL_BLV (sym)->where;
       else
@@ -3578,10 +3578,10 @@ syms_of_data (void)
   DEFVAR_LISP ("most-positive-fixnum", Vmost_positive_fixnum,
 	       doc: /* The largest value that is representable in a Lisp integer.  */);
   Vmost_positive_fixnum = make_number (MOST_POSITIVE_FIXNUM);
-  XSYMBOL (intern_c_string ("most-positive-fixnum"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("most-positive-fixnum")), 1);
 
   DEFVAR_LISP ("most-negative-fixnum", Vmost_negative_fixnum,
 	       doc: /* The smallest value that is representable in a Lisp integer.  */);
   Vmost_negative_fixnum = make_number (MOST_NEGATIVE_FIXNUM);
-  XSYMBOL (intern_c_string ("most-negative-fixnum"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("most-negative-fixnum")), 1);
 }
diff --git a/src/eval.c b/src/eval.c
index a2e9b0f30e..436953e911 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -622,18 +622,18 @@ then the value of BASE-VARIABLE is set to that of NEW-ALIAS.
 The return value is BASE-VARIABLE.  */)
   (Lisp_Object new_alias, Lisp_Object base_variable, Lisp_Object docstring)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (new_alias);
   CHECK_SYMBOL (base_variable);
 
   sym = XSYMBOL (new_alias);
 
-  if (sym->constant)
+  if (SYMBOL_CONSTANT (sym))
     /* Not sure why, but why not?  */
     error ("Cannot make a constant an alias");
 
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_FORWARDED:
       error ("Cannot make an internal variable an alias");
@@ -657,11 +657,11 @@ The return value is BASE-VARIABLE.  */)
 	error ("Don't know how to make a let-bound variable an alias");
   }
 
-  sym->declared_special = 1;
-  XSYMBOL (base_variable)->declared_special = 1;
-  sym->redirect = SYMBOL_VARALIAS;
+  SET_SYMBOL_DECLARED_SPECIAL (sym, 1);
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (base_variable), 1);
+  SET_SYMBOL_REDIRECT (sym, SYMBOL_VARALIAS);
   SET_SYMBOL_ALIAS (sym, XSYMBOL (base_variable));
-  sym->constant = SYMBOL_CONSTANT_P (base_variable);
+  SET_SYMBOL_CONSTANT (sym, SYMBOL_CONSTANT_P (base_variable));
   LOADHIST_ATTACH (new_alias);
   /* Even if docstring is nil: remove old docstring.  */
   Fput (new_alias, Qvariable_documentation, docstring);
@@ -755,7 +755,7 @@ usage: (defvar SYMBOL &optional INITVALUE DOCSTRING)  */)
       tem = Fdefault_boundp (sym);
 
       /* Do it before evaluating the initial value, for self-references.  */
-      XSYMBOL (sym)->declared_special = 1;
+      SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
 
       if (NILP (tem))
 	Fset_default (sym, eval_sub (XCAR (tail)));
@@ -779,7 +779,7 @@ usage: (defvar SYMBOL &optional INITVALUE DOCSTRING)  */)
       LOADHIST_ATTACH (sym);
     }
   else if (!NILP (Vinternal_interpreter_environment)
-	   && !XSYMBOL (sym)->declared_special)
+	   && ! SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym)))
     /* A simple (defvar foo) with lexical scoping does "nothing" except
        declare that var to be dynamically scoped *locally* (i.e. within
        the current file or let-block).  */
@@ -823,7 +823,7 @@ usage: (defconst SYMBOL INITVALUE [DOCSTRING])  */)
   if (!NILP (Vpurify_flag))
     tem = Fpurecopy (tem);
   Fset_default (sym, tem);
-  XSYMBOL (sym)->declared_special = 1;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
   tem = Fcar (XCDR (XCDR (args)));
   if (!NILP (tem))
     {
@@ -843,7 +843,7 @@ DEFUN ("internal-make-var-non-special", Fmake_var_non_special,
      (Lisp_Object symbol)
 {
   CHECK_SYMBOL (symbol);
-  XSYMBOL (symbol)->declared_special = 0;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (symbol), 0);
   return Qnil;
 }
 
@@ -885,7 +885,7 @@ usage: (let* VARLIST BODY...)  */)
 	}
 
       if (!NILP (lexenv) && SYMBOLP (var)
-	  && !XSYMBOL (var)->declared_special
+	  && ! SYMBOL_DECLARED_SPECIAL (XSYMBOL (var))
 	  && NILP (Fmemq (var, Vinternal_interpreter_environment)))
 	/* Lexically bind VAR by adding it to the interpreter's binding
 	   alist.  */
@@ -964,7 +964,7 @@ usage: (let VARLIST BODY...)  */)
       tem = temps[argnum++];
 
       if (!NILP (lexenv) && SYMBOLP (var)
-	  && !XSYMBOL (var)->declared_special
+	  && ! SYMBOL_DECLARED_SPECIAL (XSYMBOL (var))
 	  && NILP (Fmemq (var, Vinternal_interpreter_environment)))
 	/* Lexically bind VAR by adding it to the lexenv alist.  */
 	lexenv = Fcons (Fcons (var, tem), lexenv);
@@ -3000,7 +3000,7 @@ DEFUN ("fetch-bytecode", Ffetch_bytecode, Sfetch_bytecode,
    which was made in the buffer that is now current.  */
 
 bool
-let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol)
+let_shadows_buffer_binding_p (sym_t symbol)
 {
   union specbinding *p;
   Lisp_Object buf = Fcurrent_buffer ();
@@ -3008,8 +3008,8 @@ let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol)
   for (p = specpdl_ptr; p > specpdl; )
     if ((--p)->kind > SPECPDL_LET)
       {
-	struct Lisp_Symbol *let_bound_symbol = XSYMBOL (specpdl_symbol (p));
-	eassert (let_bound_symbol->redirect != SYMBOL_VARALIAS);
+	sym_t let_bound_symbol = XSYMBOL (specpdl_symbol (p));
+	eassert (SYMBOL_REDIRECT (let_bound_symbol) != SYMBOL_VARALIAS);
 	if (symbol == let_bound_symbol
 	    && EQ (specpdl_where (p), buf))
 	  return 1;
@@ -3045,13 +3045,13 @@ let_shadows_global_binding_p (Lisp_Object symbol)
 void
 specbind (Lisp_Object symbol, Lisp_Object value)
 {
-  struct Lisp_Symbol *sym;
+  sym_t sym;
 
   CHECK_SYMBOL (symbol);
   sym = XSYMBOL (symbol);
 
  start:
-  switch (sym->redirect)
+  switch (SYMBOL_REDIRECT (sym))
     {
     case SYMBOL_VARALIAS:
       sym = indirect_variable (sym); XSETSYMBOL (symbol, sym); goto start;
@@ -3062,7 +3062,7 @@ specbind (Lisp_Object symbol, Lisp_Object value)
       specpdl_ptr->let.symbol = symbol;
       specpdl_ptr->let.old_value = SYMBOL_VAL (sym);
       grow_specpdl ();
-      if (!sym->constant)
+      if (! SYMBOL_CONSTANT (sym))
 	SET_SYMBOL_VAL (sym, value);
       else
 	set_internal (symbol, value, Qnil, 1);
@@ -3078,10 +3078,10 @@ specbind (Lisp_Object symbol, Lisp_Object value)
 	specpdl_ptr->let.old_value = ovalue;
 	specpdl_ptr->let.where = Fcurrent_buffer ();
 
-	eassert (sym->redirect != SYMBOL_LOCALIZED
+	eassert (SYMBOL_REDIRECT (sym) != SYMBOL_LOCALIZED
 		 || (EQ (SYMBOL_BLV (sym)->where, Fcurrent_buffer ())));
 
-	if (sym->redirect == SYMBOL_LOCALIZED)
+	if (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED)
 	  {
 	    if (!blv_found (SYMBOL_BLV (sym)))
 	      specpdl_ptr->let.kind = SPECPDL_LET_DEFAULT;
@@ -3197,8 +3197,8 @@ unbind_once (void *ignore)
       { /* If variable has a trivial value (no forwarding), we can
            just set it.  No need to check for constant symbols here,
            since that was already done by specbind.  */
-        struct Lisp_Symbol *sym = XSYMBOL (specpdl_symbol (specpdl_ptr));
-        if (sym->redirect == SYMBOL_PLAINVAL)
+        sym_t sym = XSYMBOL (specpdl_symbol (specpdl_ptr));
+        if (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL)
           {
             SET_SYMBOL_VAL (sym, specpdl_old_value (specpdl_ptr));
             break;
@@ -3248,7 +3248,7 @@ context where binding is lexical by default.  */)
   (Lisp_Object symbol)
 {
    CHECK_SYMBOL (symbol);
-   return XSYMBOL (symbol)->declared_special ? Qt : Qnil;
+   return SYMBOL_DECLARED_SPECIAL (XSYMBOL (symbol)) ? Qt : Qnil;
 }
 
 
@@ -3397,8 +3397,8 @@ backtrace_eval_unrewind (int distance)
 	  { /* If variable has a trivial value (no forwarding), we can
 	       just set it.  No need to check for constant symbols here,
 	       since that was already done by specbind.  */
-	    struct Lisp_Symbol *sym = XSYMBOL (specpdl_symbol (tmp));
-	    if (sym->redirect == SYMBOL_PLAINVAL)
+	    sym_t sym = XSYMBOL (specpdl_symbol (tmp));
+	    if (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL)
 	      {
 		Lisp_Object old_value = specpdl_old_value (tmp);
 		set_specpdl_old_value (tmp, SYMBOL_VAL (sym));
diff --git a/src/font.c b/src/font.c
index e074c14db6..ddf28562c7 100644
--- a/src/font.c
+++ b/src/font.c
@@ -5156,19 +5156,19 @@ Each element has the form:
     [NUMERIC-VALUE SYMBOLIC-NAME ALIAS-NAME ...]
 NUMERIC-VALUE is an integer, and SYMBOLIC-NAME and ALIAS-NAME are symbols. */);
   Vfont_weight_table = BUILD_STYLE_TABLE (weight_table);
-  XSYMBOL (intern_c_string ("font-weight-table"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("font-weight-table")), 1);
 
   DEFVAR_LISP_NOPRO ("font-slant-table", Vfont_slant_table,
 	       doc: /*  Vector of font slant symbols vs the corresponding numeric values.
 See `font-weight-table' for the format of the vector. */);
   Vfont_slant_table = BUILD_STYLE_TABLE (slant_table);
-  XSYMBOL (intern_c_string ("font-slant-table"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("font-slant-table")), 1);
 
   DEFVAR_LISP_NOPRO ("font-width-table", Vfont_width_table,
 	       doc: /*  Alist of font width symbols vs the corresponding numeric values.
 See `font-weight-table' for the format of the vector. */);
   Vfont_width_table = BUILD_STYLE_TABLE (width_table);
-  XSYMBOL (intern_c_string ("font-width-table"))->constant = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (intern_c_string ("font-width-table")), 1);
 
   staticpro (&font_style_table);
   font_style_table = make_uninit_vector (3);
diff --git a/src/frame.c b/src/frame.c
index 9ab18adc4b..bb10ef9b54 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -2109,14 +2109,14 @@ store_frame_param (struct frame *f, Lisp_Object prop, Lisp_Object val)
      without messing up the symbol's status.  */
   if (SYMBOLP (prop))
     {
-      struct Lisp_Symbol *sym = XSYMBOL (prop);
+      sym_t sym = XSYMBOL (prop);
     start:
-      switch (sym->redirect)
+      switch (SYMBOL_REDIRECT (sym))
 	{
 	case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
 	case SYMBOL_PLAINVAL: case SYMBOL_FORWARDED: break;
 	case SYMBOL_LOCALIZED:
-	  { struct Lisp_Buffer_Local_Value *blv = sym->val.blv;
+	  { struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (sym);
 	    if (blv->frame_local && blv_found (blv) && XFRAME (blv->where) == f)
 	      swap_in_global_binding (sym);
 	    break;
diff --git a/src/lisp.h b/src/lisp.h
index 38d5d3cdd0..39dc624bce 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -299,10 +299,12 @@ DEFINE_GDB_SYMBOL_END (USE_LSB_TAG)
 #define lisp_h_MISCP(x) (SMOB_TYPEP (x, lisp_misc_tag))
 #define lisp_h_NILP(x) (scm_is_lisp_false (x))
 #define lisp_h_SET_SYMBOL_VAL(sym, v) \
-   (eassert ((sym)->redirect == SYMBOL_PLAINVAL), (sym)->val.value = (v))
-#define lisp_h_SYMBOL_CONSTANT_P(sym) (XSYMBOL (sym)->constant)
+   (eassert (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL), \
+      scm_c_vector_set_x (sym, 4, v))
+#define lisp_h_SYMBOL_CONSTANT_P(sym) (SYMBOL_CONSTANT (XSYMBOL (sym)))
 #define lisp_h_SYMBOL_VAL(sym) \
-   (eassert ((sym)->redirect == SYMBOL_PLAINVAL), (sym)->val.value)
+   (eassert (SYMBOL_REDIRECT (sym) == SYMBOL_PLAINVAL), \
+    scm_c_vector_ref (sym, 4))
 #define lisp_h_SYMBOLP(x) \
   (x && (scm_is_symbol (x) || EQ (x, Qnil) || EQ (x, Qt)))
 #define lisp_h_VECTORLIKEP(x) (SMOB_TYPEP (x, lisp_vectorlike_tag))
@@ -650,7 +652,9 @@ extern Lisp_Object function_module;
 extern Lisp_Object plist_module;
 extern Lisp_Object Qt, Qnil, Qt_, Qnil_;
 
-INLINE struct Lisp_Symbol *
+typedef Lisp_Object sym_t;
+
+INLINE sym_t
 XSYMBOL (Lisp_Object a)
 {
   Lisp_Object tem;
@@ -658,7 +662,7 @@ XSYMBOL (Lisp_Object a)
   if (EQ (a, Qnil)) a = Qnil_;
   eassert (SYMBOLP (a));
   tem = scm_variable_ref (scm_module_lookup (symbol_module, a));
-  return scm_to_pointer (tem);
+  return tem;
 }
 
 /* Pseudovector types.  */
@@ -721,7 +725,7 @@ make_lisp_proc (struct Lisp_Process *p)
 #define XSETFASTINT(a, b) ((a) = make_natnum (b))
 #define XSETVECTOR(a, b) ((a) = (b)->header.self)
 #define XSETSTRING(a, b) ((a) = (b)->self)
-#define XSETSYMBOL(a, b) ((a) = (b)->self)
+#define XSETSYMBOL(a, b) ((a) = scm_c_vector_ref (b, 0))
 #define XSETMISC(a, b) (a) = ((union Lisp_Misc *) (b))->u_any.self
 
 /* Pseudovector types.  */
@@ -1263,80 +1267,84 @@ enum symbol_redirect
 
 struct Lisp_Symbol
 {
-  Lisp_Object self;
+  Lisp_Object self_;
 
   /* Indicates where the value can be found:
      0 : it's a plain var, the value is in the `value' field.
      1 : it's a varalias, the value is really in the `alias' symbol.
      2 : it's a localized var, the value is in the `blv' object.
      3 : it's a forwarding variable, the value is in `forward'.  */
-  ENUM_BF (symbol_redirect) redirect : 3;
+  ENUM_BF (symbol_redirect) redirect_ : 3;
 
   /* Non-zero means symbol is constant, i.e. changing its value
      should signal an error.  If the value is 3, then the var
      can be changed, but only by `defconst'.  */
-  unsigned constant : 2;
+  unsigned constant_ : 2;
 
   /* True means that this variable has been explicitly declared
      special (with `defvar' etc), and shouldn't be lexically bound.  */
-  bool_bf declared_special : 1;
-
-  /* True if pointed to from purespace and hence can't be GC'd.  */
-  bool_bf pinned : 1;
+  bool_bf declared_special_ : 1;
 
   /* Value of the symbol or Qunbound if unbound.  Which alternative of the
      union is used depends on the `redirect' field above.  */
   union {
-    Lisp_Object value;
-    struct Lisp_Symbol *alias;
-    struct Lisp_Buffer_Local_Value *blv;
-    union Lisp_Fwd *fwd;
-  } val;
+    Lisp_Object value_;
+    sym_t alias_;
+    struct Lisp_Buffer_Local_Value *blv_;
+    union Lisp_Fwd *fwd_;
+  };
 };
 
-/* Value is name of symbol.  */
+#define SYMBOL_SELF(sym) (scm_c_vector_ref (sym, 0))
+#define SET_SYMBOL_SELF(sym, v) (scm_c_vector_set_x (sym, 0, v))
+#define SYMBOL_REDIRECT(sym) (XINT (scm_c_vector_ref (sym, 1)))
+#define SET_SYMBOL_REDIRECT(sym, v) (scm_c_vector_set_x (sym, 1, make_number (v)))
+#define SYMBOL_CONSTANT(sym) (XINT (scm_c_vector_ref (sym, 2)))
+#define SET_SYMBOL_CONSTANT(sym, v) (scm_c_vector_set_x (sym, 2, make_number (v)))
+#define SYMBOL_DECLARED_SPECIAL(sym) (XINT (scm_c_vector_ref (sym, 3)))
+#define SET_SYMBOL_DECLARED_SPECIAL(sym, v) (scm_c_vector_set_x (sym, 3, make_number (v)))
 
-LISP_MACRO_DEFUN (SYMBOL_VAL, Lisp_Object, (struct Lisp_Symbol *sym), (sym))
+/* Value is name of symbol.  */
 
-INLINE struct Lisp_Symbol *
-SYMBOL_ALIAS (struct Lisp_Symbol *sym)
+INLINE sym_t 
+SYMBOL_ALIAS (sym_t sym)
 {
-  eassert (sym->redirect == SYMBOL_VARALIAS);
-  return sym->val.alias;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_VARALIAS);
+  return scm_c_vector_ref (sym, 4);
 }
 INLINE struct Lisp_Buffer_Local_Value *
-SYMBOL_BLV (struct Lisp_Symbol *sym)
+SYMBOL_BLV (sym_t sym)
 {
-  eassert (sym->redirect == SYMBOL_LOCALIZED);
-  return sym->val.blv;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED);
+  return scm_to_pointer (scm_c_vector_ref (sym, 4));
 }
 INLINE union Lisp_Fwd *
-SYMBOL_FWD (struct Lisp_Symbol *sym)
+SYMBOL_FWD (sym_t sym)
 {
-  eassert (sym->redirect == SYMBOL_FORWARDED);
-  return sym->val.fwd;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_FORWARDED);
+  return scm_to_pointer (scm_c_vector_ref (sym, 4));
 }
 
 LISP_MACRO_DEFUN_VOID (SET_SYMBOL_VAL,
-		       (struct Lisp_Symbol *sym, Lisp_Object v), (sym, v))
+		       (sym_t sym, Lisp_Object v), (sym, v))
 
 INLINE void
-SET_SYMBOL_ALIAS (struct Lisp_Symbol *sym, struct Lisp_Symbol *v)
+SET_SYMBOL_ALIAS (sym_t sym, sym_t v)
 {
-  eassert (sym->redirect == SYMBOL_VARALIAS);
-  sym->val.alias = v;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_VARALIAS);
+  scm_c_vector_set_x (sym, 4, v);
 }
 INLINE void
-SET_SYMBOL_BLV (struct Lisp_Symbol *sym, struct Lisp_Buffer_Local_Value *v)
+SET_SYMBOL_BLV (sym_t sym, struct Lisp_Buffer_Local_Value *v)
 {
-  eassert (sym->redirect == SYMBOL_LOCALIZED);
-  sym->val.blv = v;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_LOCALIZED);
+  scm_c_vector_set_x (sym, 4, scm_from_pointer (v, NULL));
 }
 INLINE void
-SET_SYMBOL_FWD (struct Lisp_Symbol *sym, union Lisp_Fwd *v)
+SET_SYMBOL_FWD (sym_t sym, union Lisp_Fwd *v)
 {
-  eassert (sym->redirect == SYMBOL_FORWARDED);
-  sym->val.fwd = v;
+  eassert (SYMBOL_REDIRECT (sym) == SYMBOL_FORWARDED);
+  scm_c_vector_set_x (sym, 4, scm_from_pointer (v, NULL));
 }
 
 INLINE Lisp_Object
@@ -1374,6 +1382,8 @@ LISP_MACRO_DEFUN (SYMBOL_CONSTANT_P, int, (Lisp_Object sym), (sym))
 #define DEFSYM(sym, name)						\
   do { (sym) = intern_c_string ((name)); staticpro (&(sym)); } while (false)
 
+LISP_MACRO_DEFUN (SYMBOL_VAL, Lisp_Object, (sym_t sym), (sym))
+
 
 /***********************************************************************
 			     Hash Tables
@@ -2903,14 +2913,14 @@ extern Lisp_Object arithcompare (Lisp_Object num1, Lisp_Object num2,
 extern intmax_t cons_to_signed (Lisp_Object, intmax_t, intmax_t);
 extern uintmax_t cons_to_unsigned (Lisp_Object, uintmax_t);
 
-extern struct Lisp_Symbol *indirect_variable (struct Lisp_Symbol *);
+extern sym_t indirect_variable (sym_t );
 extern _Noreturn void args_out_of_range (Lisp_Object, Lisp_Object);
 extern _Noreturn void args_out_of_range_3 (Lisp_Object, Lisp_Object,
 					   Lisp_Object);
 extern Lisp_Object do_symval_forwarding (union Lisp_Fwd *);
 extern void set_internal (Lisp_Object, Lisp_Object, Lisp_Object, bool);
 extern void syms_of_data (void);
-extern void swap_in_global_binding (struct Lisp_Symbol *);
+extern void swap_in_global_binding (sym_t );
 
 /* Defined in cmds.c */
 extern void syms_of_cmds (void);
@@ -3406,7 +3416,7 @@ extern void record_in_backtrace (Lisp_Object function,
 extern void mark_specpdl (void);
 extern void get_backtrace (Lisp_Object array);
 Lisp_Object backtrace_top_function (void);
-extern bool let_shadows_buffer_binding_p (struct Lisp_Symbol *symbol);
+extern bool let_shadows_buffer_binding_p (sym_t symbol);
 extern bool let_shadows_global_binding_p (Lisp_Object symbol);
 extern _Noreturn SCM abort_to_prompt (SCM, SCM);
 extern SCM call_with_prompt (SCM, SCM, SCM);
diff --git a/src/lread.c b/src/lread.c
index a57cab6f79..9ce2bcb7a2 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -3841,8 +3841,8 @@ it defaults to the value of `obarray'.  */)
   if ((SREF (string, 0) == ':')
       && EQ (obarray, initial_obarray))
     {
-      XSYMBOL (sym)->constant = 1;
-      XSYMBOL (sym)->redirect = SYMBOL_PLAINVAL;
+      SET_SYMBOL_CONSTANT (XSYMBOL (sym), 1);
+      SET_SYMBOL_REDIRECT (XSYMBOL (sym), SYMBOL_PLAINVAL);
       SET_SYMBOL_VAL (XSYMBOL (sym), sym);
     }
 
@@ -4014,13 +4014,13 @@ init_obarray (void)
 
   Qnil_ = intern_c_string ("nil");
   SET_SYMBOL_VAL (XSYMBOL (Qnil_), Qnil);
-  XSYMBOL (Qnil_)->constant = 1;
-  XSYMBOL (Qnil_)->declared_special = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (Qnil_), 1);
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (Qnil_), 1);
 
   Qt_ = intern_c_string ("t");
   SET_SYMBOL_VAL (XSYMBOL (Qt_), Qt);
-  XSYMBOL (Qt_)->constant = 1;
-  XSYMBOL (Qt_)->declared_special = 1;
+  SET_SYMBOL_CONSTANT (XSYMBOL (Qt_), 1);
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (Qt_), 1);
 
   Qunbound = Fmake_symbol (build_pure_c_string ("unbound"));
   SET_SYMBOL_VAL (XSYMBOL (Qunbound), Qunbound);
@@ -4074,8 +4074,8 @@ defvar_int (struct Lisp_Intfwd *i_fwd,
   sym = intern_c_string (namestring);
   i_fwd->type = Lisp_Fwd_Int;
   i_fwd->intvar = address;
-  XSYMBOL (sym)->declared_special = 1;
-  XSYMBOL (sym)->redirect = SYMBOL_FORWARDED;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
+  SET_SYMBOL_REDIRECT (XSYMBOL (sym), SYMBOL_FORWARDED);
   SET_SYMBOL_FWD (XSYMBOL (sym), (union Lisp_Fwd *)i_fwd);
 }
 
@@ -4089,8 +4089,8 @@ defvar_bool (struct Lisp_Boolfwd *b_fwd,
   sym = intern_c_string (namestring);
   b_fwd->type = Lisp_Fwd_Bool;
   b_fwd->boolvar = address;
-  XSYMBOL (sym)->declared_special = 1;
-  XSYMBOL (sym)->redirect = SYMBOL_FORWARDED;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
+  SET_SYMBOL_REDIRECT (XSYMBOL (sym), SYMBOL_FORWARDED);
   SET_SYMBOL_FWD (XSYMBOL (sym), (union Lisp_Fwd *)b_fwd);
   Vbyte_boolean_vars = Fcons (sym, Vbyte_boolean_vars);
 }
@@ -4108,8 +4108,8 @@ defvar_lisp_nopro (struct Lisp_Objfwd *o_fwd,
   sym = intern_c_string (namestring);
   o_fwd->type = Lisp_Fwd_Obj;
   o_fwd->objvar = address;
-  XSYMBOL (sym)->declared_special = 1;
-  XSYMBOL (sym)->redirect = SYMBOL_FORWARDED;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
+  SET_SYMBOL_REDIRECT (XSYMBOL (sym), SYMBOL_FORWARDED);
   SET_SYMBOL_FWD (XSYMBOL (sym), (union Lisp_Fwd *)o_fwd);
 }
 
@@ -4132,8 +4132,8 @@ defvar_kboard (struct Lisp_Kboard_Objfwd *ko_fwd,
   sym = intern_c_string (namestring);
   ko_fwd->type = Lisp_Fwd_Kboard_Obj;
   ko_fwd->offset = offset;
-  XSYMBOL (sym)->declared_special = 1;
-  XSYMBOL (sym)->redirect = SYMBOL_FORWARDED;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (sym), 1);
+  SET_SYMBOL_REDIRECT (XSYMBOL (sym), SYMBOL_FORWARDED);
   SET_SYMBOL_FWD (XSYMBOL (sym), (union Lisp_Fwd *)ko_fwd);
 }
 
@@ -4440,7 +4440,7 @@ to find all the symbols in an obarray, use `mapatoms'.  */);
   DEFVAR_LISP ("values", Vvalues,
 	       doc: /* List of values of all expressions which were read, evaluated and printed.
 		       Order is reverse chronological.  */);
-  XSYMBOL (intern ("values"))->declared_special = 0;
+  SET_SYMBOL_DECLARED_SPECIAL (XSYMBOL (intern ("values")), 0);
 
   DEFVAR_LISP ("standard-input", Vstandard_input,
 	       doc: /* Stream for read to get input from.